style(proto): fix decimal_literal_representation lint

Cargo.toml

@@ -119,7 +119,6 @@ cast_possible_truncation = "allow" # TODO: consider
 cast_precision_loss = "allow" # TODO: consider
 checked_conversions = "allow"
 collapsible_match = "allow"
-decimal_literal_representation = "allow" # TODO: consider
 else_if_without_else = "allow"
 enum_glob_use = "allow"
 float_arithmetic = "allow"
@@ -160,6 +159,7 @@ arbitrary_source_item_ordering = "allow" # order: std, deps, crate
 blanket_clippy_restriction_lints = "allow" # allowlist is better
 clone_on_ref_ptr = "allow" # Arc::clone(blah) is needlessly noisy
 cognitive_complexity = "allow" # is this ever useful?
+decimal_literal_representation = "allow" # arguably more human-readable
 default_numeric_fallback = "allow" # too many false positives
 expect_used = "allow" # expect is self-documenting
 error_impl_error = "allow" # mod::Error is a fine name